Initial import of Perl5. The king is dead; long live the king!

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+=head1 NAME
+
+Term::ReadLine - Perl interface to various C<readline> packages. If
+no real package is found, substitutes stubs instead of basic functions.
+
+=head1 SYNOPSIS
+
+  use Term::ReadLine;
+  $term = new Term::ReadLine 'Simple Perl calc';
+  $prompt = "Enter your arithmetic expression: ";
+  $OUT = $term->OUT || STDOUT;
+  while ( defined ($_ = $term->readline($prompt)) ) {
+    $res = eval($_), "\n";
+    warn $@ if $@;
+    print $OUT $res, "\n" unless $@;
+    $term->addhistory($_) if /\S/;
+  }
+
+=head1 DESCRIPTION
+
+This package is just a front end to some other packages. At the moment
+this description is written, the only such package is Term-ReadLine,
+available on CPAN near you. The real target of this stub package is to
+set up a common interface to whatever Readline emerges with time.
+
+=head1 Minimal set of supported functions
+
+All the supported functions should be called as methods, i.e., either as 
+
+  $term = new Term::ReadLine 'name';
+
+or as 
+
+  $term->addhistory('row');
+
+where $term is a return value of Term::ReadLine-E<gt>Init.
+
+=over 12
+
+=item C<ReadLine>
+
+returns the actual package that executes the commands. Among possible
+values are C<Term::ReadLine::Gnu>, C<Term::ReadLine::Perl>,
+C<Term::ReadLine::Stub Exporter>.
+
+=item C<new>
+
+returns the handle for subsequent calls to following
+functions. Argument is the name of the application. Optionally can be
+followed by two arguments for C<IN> and C<OUT> filehandles. These
+arguments should be globs.
+
+=item C<readline>
+
+gets an input line, I<possibly> with actual C<readline>
+support. Trailing newline is removed. Returns C<undef> on C<EOF>.
+
+=item C<addhistory>
+
+adds the line to the history of input, from where it can be used if
+the actual C<readline> is present.
+
+=item C<IN>, $C<OUT>
+
+return the filehandles for input and output or C<undef> if C<readline>
+input and output cannot be used for Perl.
+
+=item C<MinLine>
+
+If argument is specified, it is an advice on minimal size of line to
+be included into history.  C<undef> means do not include anything into
+history. Returns the old value.
+
+=item C<findConsole>
+
+returns an array with two strings that give most appropriate names for
+files for input and output using conventions C<"E<lt>$in">, C<"E<gt>out">.
+
+=item Attribs
+
+returns a reference to a hash which describes internal configuration
+of the package. Names of keys in this hash conform to standard
+conventions with the leading C<rl_> stripped.
+
+=item C<Features>
+
+Returns a reference to a hash with keys being features present in
+current implementation. Several optional features are used in the
+minimal interface: C<appname> should be present if the first argument
+to C<new> is recognized, and C<minline> should be present if
+C<MinLine> method is not dummy.  C<autohistory> should be present if
+lines are put into history automatically (maybe subject to
+C<MinLine>), and C<addhistory> if C<addhistory> method is not dummy.
+
+If C<Features> method reports a feature C<attribs> as present, the
+method C<Attribs> is not dummy.
+
+=back
+
+=head1 Additional supported functions
+
+Actually C<Term::ReadLine> can use some other package, that will
+support reacher set of commands.
+
+All these commands are callable via method interface and have names
+which conform to standard conventions with the leading C<rl_> stripped.
+
+The stub package included with the perl distribution allows some
+additional methods: 
+
+=over 12
+
+=item C<tkRunning>
+
+makes Tk event loop run when waiting for user input (i.e., during
+C<readline> method).
+
+=item C<ornaments>
+
+makes the command line stand out by using termcap data.  The argument
+to C<ornaments> should be 0, 1, or a string of a form
+C<"aa,bb,cc,dd">.  Four components of this string should be names of
+I<terminal capacities>, first two will be issued to make the prompt
+standout, last two to make the input line standout.
+
+=item C<newTTY>
+
+takes two arguments which are input filehandle and output filehandle.
+Switches to use these filehandles.
+
+=back
+
+One can check whether the currently loaded ReadLine package supports
+these methods by checking for corresponding C<Features>.
+
+=head1 EXPORTS
+
+None
+
+=head1 ENVIRONMENT
+
+The envrironment variable C<PERL_RL> governs which ReadLine clone is
+loaded. If the value is false, a dummy interface is used. If the value
+is true, it should be tail of the name of the package to use, such as
+C<Perl> or C<Gnu>.  
+
+As a special case, if the value of this variable is space-separated,
+the tail might be used to disable the ornaments by setting the tail to
+be C<o=0> or C<ornaments=0>.  The head should be as described above, say
+
+If the variable is not set, or if the head of space-separated list is
+empty, the best available package is loaded.
+
+  export "PERL_RL=Perl o=0"	# Use Perl ReadLine without ornaments
+  export "PERL_RL= o=0"		# Use best available ReadLine without ornaments
+
+(Note that processing of C<PERL_RL> for ornaments is in the discretion of the 
+particular used C<Term::ReadLine::*> package).
+
+=cut
+
+package Term::ReadLine::Stub;
+@ISA = qw'Term::ReadLine::Tk Term::ReadLine::TermCap';
+
+$DB::emacs = $DB::emacs;	# To peacify -w
+*rl_term_set = \@Term::ReadLine::TermCap::rl_term_set;
+
+sub ReadLine {'Term::ReadLine::Stub'}
+sub readline {
+  my $self = shift;
+  my ($in,$out,$str) = @$self;
+  print $out $rl_term_set[0], shift, $rl_term_set[1], $rl_term_set[2]; 
+  $self->register_Tk 
+     if not $Term::ReadLine::registered and $Term::ReadLine::toloop
+	and defined &Tk::DoOneEvent;
+  #$str = scalar <$in>;
+  $str = $self->get_line;
+  print $out $rl_term_set[3]; 
+  # bug in 5.000: chomping empty string creats length -1:
+  chomp $str if defined $str;
+  $str;
+}
+sub addhistory {}
+
+sub findConsole {
+    my $console;
+
+    if (-e "/dev/tty") {
+	$console = "/dev/tty";
+    } elsif (-e "con" or $^O eq 'MSWin32') {
+	$console = "con";
+    } else {
+	$console = "sys\$command";
+    }
+
+    if (($^O eq 'amigaos') || ($^O eq 'beos')) {
+	$console = undef;
+    }
+    elsif ($^O eq 'os2') {
+      if ($DB::emacs) {
+	$console = undef;
+      } else {
+	$console = "/dev/con";
+      }
+    }
+
+    $consoleOUT = $console;
+    $console = "&STDIN" unless defined $console;
+    if (!defined $consoleOUT) {
+      $consoleOUT = defined fileno(STDERR) ? "&STDERR" : "&STDOUT";
+    }
+    ($console,$consoleOUT);
+}
+
+sub new {
+  die "method new called with wrong number of arguments" 
+    unless @_==2 or @_==4;
+  #local (*FIN, *FOUT);
+  my ($FIN, $FOUT, $ret);
+  if (@_==2) {
+    ($console, $consoleOUT) = findConsole;
+
+    open(FIN, "<$console"); 
+    open(FOUT,">$consoleOUT");
+    #OUT->autoflush(1);		# Conflicts with debugger?
+    $sel = select(FOUT);
+    $| = 1;				# for DB::OUT
+    select($sel);
+    $ret = bless [\*FIN, \*FOUT];
+  } else {			# Filehandles supplied
+    $FIN = $_[2]; $FOUT = $_[3];
+    #OUT->autoflush(1);		# Conflicts with debugger?
+    $sel = select($FOUT);
+    $| = 1;				# for DB::OUT
+    select($sel);
+    $ret = bless [$FIN, $FOUT];
+  }
+  if ($ret->Features->{ornaments} 
+      and not ($ENV{PERL_RL} and $ENV{PERL_RL} =~ /\bo\w*=0/)) {
+    local $Term::ReadLine::termcap_nowarn = 1;
+    $ret->ornaments(1);
+  }
+  return $ret;
+}
+
+sub newTTY {
+  my ($self, $in, $out) = @_;
+  $self->[0] = $in;
+  $self->[1] = $out;
+  my $sel = select($out);
+  $| = 1;				# for DB::OUT
+  select($sel);
+}
+
+sub IN { shift->[0] }
+sub OUT { shift->[1] }
+sub MinLine { undef }
+sub Attribs { {} }
+
+my %features = (tkRunning => 1, ornaments => 1, 'newTTY' => 1);
+sub Features { \%features }
+
+package Term::ReadLine;		# So late to allow the above code be defined?
+
+my ($which) = exists $ENV{PERL_RL} ? split /\s+/, $ENV{PERL_RL} : undef;
+if ($which) {
+  if ($which =~ /\bgnu\b/i){
+    eval "use Term::ReadLine::Gnu;";
+  } elsif ($which =~ /\bperl\b/i) {
+    eval "use Term::ReadLine::Perl;";
+  } else {
+    eval "use Term::ReadLine::$which;";
+  }
+} elsif (defined $which and $which ne '') {	# Defined but false
+  # Do nothing fancy
+} else {
+  eval "use Term::ReadLine::Gnu; 1" or eval "use Term::ReadLine::Perl; 1";
+}
+
+#require FileHandle;
+
+# To make possible switch off RL in debugger: (Not needed, work done
+# in debugger).
+
+if (defined &Term::ReadLine::Gnu::readline) {
+  @ISA = qw(Term::ReadLine::Gnu Term::ReadLine::Stub);
+} elsif (defined &Term::ReadLine::Perl::readline) {
+  @ISA = qw(Term::ReadLine::Perl Term::ReadLine::Stub);
+} else {
+  @ISA = qw(Term::ReadLine::Stub);
+}
+
+package Term::ReadLine::TermCap;
+
+# Prompt-start, prompt-end, command-line-start, command-line-end
+#     -- zero-width beautifies to emit around prompt and the command line.
+@rl_term_set = ("","","","");
+# string encoded:
+$rl_term_set = ',,,';
+
+sub LoadTermCap {
+  return if defined $terminal;
+  
+  require Term::Cap;
+  $terminal = Tgetent Term::Cap ({OSPEED => 9600}); # Avoid warning.
+}
+
+sub ornaments {
+  shift;
+  return $rl_term_set unless @_;
+  $rl_term_set = shift;
+  $rl_term_set ||= ',,,';
+  $rl_term_set = 'us,ue,md,me' if $rl_term_set eq '1';
+  my @ts = split /,/, $rl_term_set, 4;
+  eval { LoadTermCap };
+  unless (defined $terminal) {
+    warn("Cannot find termcap: $@\n") unless $Term::ReadLine::termcap_nowarn;
+    $rl_term_set = ',,,';
+    return;
+  }
+  @rl_term_set = map {$_ ? $terminal->Tputs($_,1) || '' : ''} @ts;
+  return $rl_term_set;
+}
+
+
+package Term::ReadLine::Tk;
+
+$count_handle = $count_DoOne = $count_loop = 0;
+
+sub handle {$giveup = 1; $count_handle++}
+
+sub Tk_loop {
+  # Tk->tkwait('variable',\$giveup);	# needs Widget
+  $count_DoOne++, Tk::DoOneEvent(0) until $giveup;
+  $count_loop++;
+  $giveup = 0;
+}
+
+sub register_Tk {
+  my $self = shift;
+  $Term::ReadLine::registered++ 
+    or Tk->fileevent($self->IN,'readable',\&handle);
+}
+
+sub tkRunning {
+  $Term::ReadLine::toloop = $_[1] if @_ > 1;
+  $Term::ReadLine::toloop;
+}
+
+sub get_c {
+  my $self = shift;
+  $self->Tk_loop if $Term::ReadLine::toloop && defined &Tk::DoOneEvent;
+  return getc $self->IN;
+}
+
+sub get_line {
+  my $self = shift;
+  $self->Tk_loop if $Term::ReadLine::toloop && defined &Tk::DoOneEvent;
+  my $in = $self->IN;
+  local ($/) = "\n";
+  return scalar <$in>;
+}
+
+1;
+